Despite the title, this one's more of a seafaring adventure than a horror movie. This is an edited version of "Sea Fiend (1936)". This print is a little faded in places, but still watchable. Taken from a VHS source.
February 1, 2011 Subject:
Good example of bad movie recycling
This terrible Mexican-American co-production, padded with tons of stock footage, was re-released as an exploitation film in 1946. Scenes of topless native girls were added so it could be reissued as an adults-only roadshow picture, "Devil Monster".
Note the fake painted-on foliage partly obscuring the semi-clad natives paddling a canoe at 11:33.
the print may be watchable but you'll wish you had done something else!
The "tiger shark" is a large leopard shark which is a completely harmless species (unless you put your hand in its mouth) which gets killed for the movie and the devil making a commotion is a fight, it appears, of an octopus and a mantis shrimp (only the tail of the shrimp can be seen.
Now a mantis shrimp can take your finger right off and is actually the only dangerous animal in the whole movie, but you'd have to be a marine biologist to know that!